回覆: [PATCH 3/4] dt-bindings: ipmi: Add optiona l LPC properties to ASPEED BT devices
YC Hsieh <[email protected]> Mon, 13 Jul 2026 05:34:16 +0000
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On Tue, Jun 30, 2026 at 08:11:34AM +0200, Krzysztof Kozlowski wrote:</div>
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> What</div>
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> </div>
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> is</div>
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> </div>
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> with</div>
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> this</div>
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> line breaks?</div>
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Apologies for the broken formatting in the commit message.</div>
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I will fix it in the next revision.</div>
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> No, you do not get second reg property.</div>
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> No, you do not get second interrupts property.</div>
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Understood.</div>
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These values are not addressable resources of the BMC node itself;</div>
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rather, they describe how the BMC's LPC engine is exposed on the host</div>
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LPC bus. I am not sure how they should be represented in DT, since</div>
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they do not seem to fit the usual semantics of either "reg" or &q=
uot;interrupts".</div>
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Do you have a preferred way to represent this kind of host-facing LPC</div>
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configuration in the binding?</div>
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Thanks,</div>
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Yu-Che</div>
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: 12pt; color: rgb(0, 0, 0);">
<br>
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<b>=B1H=A5=F3=AA=CC:</b> Krzysztof Kozlowski <[email protected]><br>
<b>=A4w=B6=C7=B0e:</b> =ACP=B4=C1=A4G, 2026 =A6~ 6 =A4=EB 30 =A4=E9 =A4U=A4=
=C8 02:11<br>
<b>=A6=AC=A5=F3=AA=CC:</b> YC Hsieh <[email protected]>; Corey =
Minyard <[email protected]>; Rob Herring <[email protected]>; Krz=
ysztof Kozlowski <[email protected]>; Conor Dooley <conor+dt@kern=
el.org>; Joel Stanley <[email protected]>; Andrew Jeffery <andrew@=
codeconstruct.com.au><br>
<b>=B0=C6=A5=BB:</b> [email protected] <openipmi-=
[email protected]>; [email protected] <linux=
[email protected]>; [email protected] <devicetree@vger=
.kernel.org>; [email protected] <linux-arm-kernel@=
lists.infradead.org>;
[email protected] <[email protected]><br>
<b>=A5D=A6=AE:</b> Re: [PATCH 3/4] dt-bindings: ipmi: Add optional LPC prop=
erties to ASPEED BT devices
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<br>
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<div style=3D"font-size: 11pt;">On 29/06/2026 08:49, Yu-Che Hsieh via B4 Re=
lay wrote:<br>
> From: Yu-Che Hsieh <[email protected]><br>
><br>
> Allocating IO and IRQ resources to LPC devices is in-theory an operati=
on<br>
><br>
> for the host, however ASPEED systems describe these resources through<=
br>
><br>
> BMC-internal configuration, as already supported by the ASPEED KCS BMC=
<br>
<br>
What<br>
<br>
is<br>
<br>
with<br>
<br>
this<br>
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line breaks?<br>
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<br>
><br>
> binding.<br>
><br>
> Add aspeed,lpc-io-reg and aspeed,lpc-interrupts to the ASPEED BT BMC<b=
r>
><br>
> binding so firmware can describe the host LPC IO address and SerIRQ<br=
>
><br>
> configuration using the same properties as KCS devices.<br>
><br>
> Signed-off-by: Yu-Che Hsieh <[email protected]><br>
> ---<br>
> .../bindings/ipmi/aspeed,ast2400-ibt-bmc.yaml &=
nbsp; | 21 +++++++++++++++++++++<br>
> 1 file changed, 21 insertions(+)<br>
><br>
> diff --git a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt=
-bmc.yaml b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.y=
aml<br>
> index c4f7cdbbe16b..1803c6bbae93 100644<br>
> --- a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.ya=
ml<br>
> +++ b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.ya=
ml<br>
> @@ -25,6 +25,24 @@ properties:<br>
> interrupts:<br>
> maxItems: 1<br>
> <br>
> + aspeed,lpc-io-reg:<br>
> + $ref: /schemas/types.yaml#/definitions/uint32-arra=
y<br>
> + maxItems: 1<br>
> + description: |<br>
> + The host CPU LPC IO address for the BT=
device.<br>
<br>
No, you do not get second reg property.<br>
<br>
> +<br>
> + aspeed,lpc-interrupts:<br>
> + $ref: /schemas/types.yaml#/definitions/uint32-arra=
y<br>
> + minItems: 2<br>
> + maxItems: 2<br>
> + description: |<br>
> + A 2-cell property expressing the LPC S=
erIRQ number and the interrupt<br>
> + level/sense encoding (specified in the=
standard fashion).<br>
> +<br>
> + Note that the generated interrupt is i=
ssued from the BMC to the host, and<br>
> + thus the target interrupt controller i=
s not captured by the BMC's<br>
> + devicetree.<br>
<br>
No, you do not get second interrupts property.<br>
<br>
><br>
<br>
<br>
Best regards,<br>
Krzysztof<br>
</div>
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